1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Mixed modeThe European Standard EN 60068-2-80:2005 has the status of a British StandardICS 19.040;
2、29.020Environmental testing Part 2-80: Tests Test Fi: Vibration BRITISH STANDARDBS EN 60068-2-80: 2005BS EN 60068-2-80:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 January 2006 BSI 9 January 2006ISBN 0 580 46536 5Cross-referencesThe
3、British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards
4、 Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an in
5、side front cover, the EN title page, pages 2 to 42, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can
6、 be obtained on request to its secretary.enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of
7、EN 60068-2-80:2005. It is identical with IEC 60068-2-80:2005.The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental testing, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee
8、 any EUROPEAN STANDARD EN 60068-2-80 NORME EUROPENNE EUROPISCHE NORM July 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2
9、005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-80:2005 E ICS 19.040; 29.020 English version Environmental testing Part 2-80: Tests Test Fi: Vibration Mixed mode (IEC 60068-2-80:2005) Essais denvironnement Partie 2-80:
10、 Essais Essai Fi: Vibration - Mode mixte (CEI 60068-2-80:2005) Umgebungseinflsse Teil 2-80: Prfverfahren Prfung Fi: Mixed-Mode Vibrationsprfung(IEC 60068-2-80:2005) This European Standard was approved by CENELEC on 2005-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulat
11、ions which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This
12、European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members
13、are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
14、and United Kingdom. Foreword The text of document 104/363/FDIS, future edition 1 of IEC 60068-2-80, prepared by IEC TC 104, Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-2-80 on 2005-06-01. The fol
15、lowing dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2006-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-06-01 Annex ZA has been
16、 added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-80:2005 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: ISO/IEC 17025 NOTE Har
17、monized as EN ISO/IEC 17025:2000 (not modified). _ EN 60068-2-80:2005 2 3 EN 60068-2-80:2005CONTENTS INTRODUCTION.5 1 Scope 6 2 Normative references .6 3 Terms and definitions .7 4 Requirements for testing.12 4.1 General .12 4.2 Control systems.12 4.3 Basic motion12 4.4 Cross axis motion12 4.5 Mount
18、ing .13 4.6 Measuring systems13 5 Requirements for testing mixed mode .14 5.1 Vibration tolerances Random 15 5.2 Vibration tolerances Sine 18 5.3 Control strategy.19 5.4 Vibration response investigation 20 6 Severities.20 6.1 Broadband random vibration 21 6.2 Random narrowbands21 6.3 Sine tones.22 7
19、 Preconditioning 23 8 Initial measurements 23 9 Testing.23 9.1 General .23 9.2 Initial vibration response investigation24 9.3 Low-level excitation for equalization prior to testing25 9.4 Mixed mode testing25 9.5 Final vibration response investigation.26 10 Intermediate measurements26 11 Recovery26 1
20、2 Final measurements .26 13 Information to be given in the relevant specification.26 14 Information to be given in the test report .27 Annex A (informative) Mixed mode general information.29 Annex B (informative) Guidance.35 Bibliography .41 EN 60068-2-80:2005 4 Annex ZA (normative) Normative refere
21、nces to international publications with their corresponding European publications42 Figure 1 Boundaries for acceleration spectral density (see also 5.1.1)14 Figure 2 Stochastical excitation, representation of signal clipping and Gaussian (normal) probability.15 Figure 3 Statistical accuracy of accel
22、eration spectral density versus degrees of Figure 4 Distribution (probability density) of sine, sine-on-random and random signals 17 Figure 5 Recommended sinusoidal sweep rate as a function of power ratio for sine on random depending on .23 sorEFigure A.1 Sine at 160 Hz 31 Figure A.2 Sine at 380 Hz
23、32 Figure A.3 Auto correlation Sine at 160 Hz 32 Table A.1 Determination of sine wave with APD calculation 33 Table A.2 Determination of sine wave with autocorrelation calculation.34 freedom for different confidence levels 16 5 EN 60068-2-80:2005INTRODUCTION This method for mixed mode vibration test
24、ing requires the digital control of broadband random vibrations and techniques associated with the combination of sinusoidal vibration and/or specified narrowband random with a broadband random background. This standard is intended for general application to components, equipment and other products,
25、 hereinafter referred to as ”specimens”, when simulation is required of broadband responses of a complex nature for the specimens. The test method is based primarily on the use of an electrodynamic or a servo-hydraulic vibration generator with an associated computer based control system used as a vi
26、bration testing system. It is emphasized that mixed mode testing always demands a certain degree of engineering judgement and both supplier and purchaser should be fully aware of this fact. The writer of the relevant specification is expected to select the testing procedure and the values of severit
27、y appropriate to the specimen and its use. EN 60068-2-80:2005 6 ENVIRONMENTAL TESTING Part 2-80: Tests Test Fi: Vibration Mixed mode 1 Scope This part of IEC 60068 is intended for general application for testing specimens when simulation is required of vibration excitation of a complex and mixed nat
28、ure. The purpose of the test is to demonstrate the adequacy of the specimen to resist the specified mixed mode excitation without unacceptable degradation of its functional and/or structural performance. It is particularly useful for tailoring mixed mode environments where measured data are availabl
29、e for the real life environment. The test also helps reveal the accumulated effects of stress induced by random vibration, mixed with sine and/or random, and the resulting mechanical weakness and degradation in specified performances, and to use this information, in conjunction with the relevant spe
30、cification, to assess the acceptability of specimens. In some cases, this standard may also be used to demonstrate the mechanical robustness of specimens. This standard is applicable to specimens which may be subjected to vibration of a random and/or a combination of random and deterministic nature
31、resulting from transportation or real life environments, for example in aircraft, space vehicles and for items in their transportation container when the latter may be considered as part of the specimen itself. Although primarily intended for electrotechnical specimens, this standard is not restrict
32、ed to such specimens and may be used in other fields where desired. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced doc
33、ument (including any amendments) applies. IEC 60050(300):2001, International Electrotechnical Vocabulary (IEV) Electrical and electronic measurements and measuring instruments Part 311: General terms relating to measurements Part 312: General terms relating to electrical measurements Part 313: Types
34、 of electrical measuring instruments Part 314: Specific terms according to the type of instrument IEC 60068-1:1988, Environmental testing Part 1: General and guidance IEC 60068-2-6:1995, Environmental testing Part 2-6: Tests -Test Fc: Vibration (sinusoidal) IEC 60068-2-47:1999, Environmental testing
35、 Part 2-47: Test methods Mounting of components, equipment and other articles for vibration, impact and similar dynamic tests 7 EN 60068-2-80:2005IEC 60068-2-64:1993, Environmental testing Part 2-64: Test methods Test Fh: Vibration, broadband random (digital control) and guidance IEC 60068-3-8:2003,
36、 Environmental testing Part 3-8: Supporting documentation and guidance Selecting amongst vibration tests IEC 60068-5-2:1990, Environmental testing Part 5-2: Guide to drafting of test methods Terms and definitions ISO 2041:1990, Vibration and shock Vocabulary 3 Terms and definitions For the purposes
37、of this document, the following terms and definitions are generally defined in ISO 2041, IEC 60050(300), IEC 60068-1, IEC 60068-2-6, IEC 60068-2-64 and IEC 60068-5-2. Where, for the convenience of the reader, a definition from one of those sources is included here, the derivation is indicated and de
38、partures from the definitions in those sources are also indicated. The additional terms and definitions that follow are also applicable. 3.1 cross axis motion motion not in the direction of the external stimulus, generally specified in the two orthogonal axes 3.2 actual motion motion represented by
39、the wideband signal returned from the reference point transducer 3.3 fixing point part of the specimen in contact with the fixture or vibration table at a point where the specimen is normally fastened in service NOTE If a part of the real mounting structure is used as the fixture, the fixing points
40、are taken as those of the mounting structure and not of the specimen. 3.4 control point 3.4.1 single point control control method using the signal from the transducer at the reference point in order to maintain this point at the specified vibration level 3.4.2 multipoint control control method using
41、 the signals from each of the transducers at the check points. The signals are either continuously averaged arithmetically or processed by using comparison techniques, depending upon the relevant specification, see also 3.9 3.5 gnstandard acceleration due to the earths gravity, which itself varies w
42、ith altitude and geo-graphical latitude NOTE For the purposes of this standard, the value of gnis rounded up to the nearest whole number, i.e. 10 m/s2. EN 60068-2-80:2005 8 3.6 measuring points specific points at which data are gathered for conducting the test. These points are of three types, as de
43、fined below 3.6.1 check point point located on the fixture, on the vibration table or on the specimen as close as possible to one of its fixing points, and in any case rigidly connected to it NOTE 1 A number of check points are used as a means of ensuring that the test requirements are satisfied. NO
44、TE 2 If four or fewer fixing points exist, each is used as a check point. If more than four fixing points exist, four representative fixing points will be defined in the relevant specification to be used as check points. NOTE 3 In special cases, for example for large or complex specimens, the check
45、points will be prescribed by the relevant specification if not close to the fixing points. NOTE 4 Where a large number of small specimens are mounted on one fixture, or in the case of a small specimen where there are a number of fixing points, a single check point (that is the reference point) may b
46、e selected for the derivation of the control signal. This signal is then related to the fixture rather than to the fixing points of the specimen(s). This procedure is only valid when the lowest resonance frequency of the loaded fixture is well above the upper frequency of the test. 3.6.2 reference p
47、oint point, chosen from the check points, signal of which is used to control the test, such that the requirements of this standard are satisfied 3.6.3 fictitious reference point point derived from multiple check points either manually or automatically, the result of which is used to control the test
48、, so that the requirements of this standard are satisfied 3.6.4 response points specific points on the specimen from which data is gathered for the purpose of the vibration response investigation NOTE These points are not check or reference points 3.7 preferred testing axes three orthogonal axes tha
49、t correspond to the most vulnerable axes of the specimen 3.8 sampling frequency number of discrete magnitude values taken per second to record or represent a time-history in a digital form 3.9 multipoint control strategies method for calculating the reference control signal when using multipoint control. The following frequency domain control strategies are available, see also 3.4.2 3.9
